如何设置视图的最大高度限制？
[英]How to set max height constraint for a view?
问题描述
I have a view and I want it's height to be equal to %20 of its parent. 
我有一个视图，我希望它的高度等于其父级的％20。 However, its height should be less than 64px. 但是，其高度应小于64px。 How to set this up in storyboard? 如何在情节提要中进行设置？
1 个解决方案
解决方案1
2 已采纳 2018-06-12 14:43:29
Like this (the two views are called Superview and Subview; ignore everything but the first and last constraints in the screenshot): 这样（两个视图分别称为“ Superview”和“ Subview”；忽略屏幕截图中的第一个和最后一个约束除外）：
The subview has an internal height constraint that's a less-than-or-equal-to-64 constraint. 子视图具有内部高度约束，该约束小于或等于64约束。 The height equality constraint between the superview and subview has a multiplier of 0.2 (that's your 20%) but a priority of 999. 超级视图和子视图之间的高度相等约束的乘数为0.2 （即您的20％），但优先级为999。
Result (superview is black, subview is white, subview is at top of superview): when the superview is short, subview is 20% of its height: 结果（超级视图为黑色，子视图为白色，子视图位于超级视图的顶部）：当超级视图较短时，子视图为其高度的20％：
... but when superview is tall, subview cannot grow beyond 64 points in height. ...但是当超级视图很高时，子视图的高度不能超过64点。 (Points, not px. Points are not pixels. Be careful.) （点不是px。点不是像素。请注意。）
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